Drain-pipe strainer



Feb. 16 1926.

N. HOLLAND DRAIN PIPE STBAINER Filed July 13, 1923 dum/ ow W m a Patented Feb. 16, 1926.

UNITED STATES PATENT OFFICE.

DRAIN-PIPE STRAINER.

Application filed July 13, 1823.

To (:11 11:72am .51 may concern:

Be it known that I, NORMAN Hermann, of the city of lVestmount, Province of Quebee, Dominion of Canada, a subject of the King of Great Britain have invented certain new and useful Improvements in Drain- Pipe Strainers; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates particularly to strainers adapted to be positioned within the upper ends of vertical drain pipes for draining fiat roofs and the like.

The invention has for its object to provide a strainer of this type which will overcome the defects experienced with the Wire cage strainers heretofore employed. latter are defective for the reason that they weak and spread when in use and allow the coarse roofing material and other foreign matter to drop into and block the drain pipes.

These defects are believed to be eliminated by the construction hereinafter set forth as it constitutes a strainer which will not rust and which possesses great strength and durability and can be manufactured at a comparatively low cost.

For full comprehension however of my invention, reference must be had to the accompanying drawings in which similar reference characters indicate the same parts, and wherein:

Figure 1 is a vertical sectional view of a strainer constructed according to my invention and illustrating it in use;

Figure 2 is a plan view thereof;

Figure 3 is a sectional view taken on line 3-3 Figure l; and

Figure l is a sectional view taken on line =l-+.t Figure 1.

Referring to Figure l of the accompanying drawings a portion of a roof is indicated at 2 and the mouth or upper end of a vertical drain pipe for draining the same at 3.

My improved strainer is constructed entirely of a sheet metal which will not rust such as copper and is preferably constructed in three parts, namely a tube 4 of sufficient diameter to fit snugly within the mouth of the drain pipe, an inverted truncated conical portion 5 mounted upon the upper end The I Serial No. 651,405.

of the tube and forming a flared mouth projecting above the roof, and a conical top 6 seated upon and extending across the flared mouth.

The tube 4 consists of a unitary sheet of copper bent to cylindrical form with its vertical edges folded back in hook form as at 7 and interlocked with each other in over lappingrelation and soldered, the inner edge being inwardly offset as at 8 to provide an even exterior. The upper end of the tube is bent outwardly to provide a continuous flange 9 upon which the portion 5 is soldered or otherwise secured.

The inverted truncated conical portion 5 is perforated as at 10, the perforations being arranged in circular series and those of one 7 series being staggered with relation to those of adjoining series. It also is constructed in one piece, its edges being interlocked as at 12 in a manner similar to those of the tube 4 and its upper end is outwardly flanged as at 13 to formra seat for the top 6. The latter is also perforated as at 14- and its edges interlocked as at 15. Its bottom edge is outwardly flanged as at 16 and bent back beneath the flange 13 and soldered thereto.

- The structure thus formed possesses great strength as the interlocked portions impart rigidity thereto and its life will be many times that of the ordinary wire cage strainer heretofore in use.

hat I claim is as follows A sheet metal strainer of the type described consisting of a tube and a hollow perforated top secured upon one end of the tube, said top consisting of a perforated portion of inverted truncated conical form secured upon the tube and a perforated coni cal top portion secured upon the inverted conical top portion, said top being reinforced at its middle by a continuous circumferential head, said bead being constituted by an outwardly projecting continuous flange on the top of the inverted conical portion and a continuous flange of channel cross-section on the bottom of the conical top portion, said channel flange embracing the first-mentioned flange.

In testimony whereof I have signed my name to this specification.

NORMAN HOLLAND. 

